Weak value amplification in resonance fluorescence

• Published in: Current science (Bangalore) Vol. 109; no. 11; pp. 2002 - 2005
• Main Authors: Sainadh, U. Satya, Sandhya, S. N., Vathsan, Radhika, Narayanan, Andal
• Format: Journal Article
• Language: English
• Published: Current Science Association 10.12.2015
• Subjects: SPECIAL SECTION: QUANTUM MEASUREMENTS
• ISSN: 0011-3891
• DOI: 10.18520/cs/v109/i11/2002-2005

The concept of weak measurement and associated weak value amplification has sharpened our understanding of the measurement process in quantum mechanics. Recent experiments show that elastic scattering events in resonance fluorescence experiments can exhibit weak value amplification effect, by post-selecting a particular measurement outcome. In this article, we theoretically analyse the physics behind this amplification process. We show that, in general, weak interaction and the associated weak value amplification in resonance fluorescence can be derived from the well-known theory of spontaneous emission put forth by Wigner and Weiskopff. Using this theory we show that in the elastic scattering regime of resonance fluorescence, weak value amplification helps in segregating rare events. To our knowledge, weak value amplification has not been applied earlier in the time domain as a potential tool to study rare events.